I too would prefer that merchants definitely not do the changing for me. However, I'm using a Mac and haven't run into any renamer software I could use yet. If I do it by hand, can I just change the ending of the name from *.pz2 to *.cm2 or do I need to open the file up in a text editor and change entries inside the file? And if the text editor is the only way to go, where exactly should I look for things to change? I'm really hesitant to start fiddling with the insides of Poser files ;P